mips: mt76xx: Add sysreset support

This patch adds the necessary sysreset DT node and enables the required
drivers via Kconfig.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>

arch/mips/Kconfig

@@ -83,6 +83,7 @@ config ARCH_MT7620
 	select SUPPORTS_CPU_MIPS32_R1
 	select SUPPORTS_CPU_MIPS32_R2
 	select SUPPORTS_LITTLE_ENDIAN
+	select SYSRESET
 
 config MACH_PIC32
 	bool "Support Microchip PIC32"

arch/mips/dts/mt7628a.dtsi

@@ -41,6 +41,13 @@
 			reg = <0x0 0x100>;
 		};
 
+		syscon-reboot {
+			compatible = "syscon-reboot";
+			regmap = <&sysc>;
+			offset = <0x34>;
+			mask = <0x1>;
+		};
+
 		intc: interrupt-controller@200 {
 			compatible = "ralink,rt2880-intc";
 			reg = <0x200 0x100>;